For me 6054 ("Baumhöhle" mit Robin Hood und Wachtposten) was the very first Forestmen I got. In Germany the complete Robin Hood line started in 1988 (6066 hadn't been available already in 1987 here), so when i took a look at that year's catalogue I was like "must have!" And I got 6054 for my birthday (and with that I was the first of my friends who had a Robin Hood, because their birthdays are later in the year. :-) )
So, in any case, my judgement of this set cannot be objective. It just was too great back then. First green minifigs, first foliage, first barrel! Fine tree-look but still beautiful and colourful with this blue roof. Those Forestmen shields have been very precious during my childhood.
I still wondered why for heaven's sake all of those secret hideouts have been "camouflaged" with bright red flags?
Today 6054 is still a beautiful set for me. Though I think there should be even more foliage parts attached (some branches are empty). I do not complain about the set having just to minifigs. It's a hideout, and both men can hide in this tree. More men wouldn't fit.